73/1000, none of the terms is zero but the sum is 0, power series of sine

71/1000, limits from a graph

75/1000, why dxdy=rdrdθ, computing the Jacobian, calculus 3

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38/1000, don't get these derivatives wrong! calculus 1

42/1000, epsilon-delta proof of a limit, calculus 1

53/1000, sketching the graph of the derivative from the original function, calculus 1

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